This permanent A list actress/singer is an Oscar winner/nominee. Back in the day she was at a crossroads early on in her film career.
Her then soon-to-be ex husband, a B-list character actor, was tied up in a breach of contract suit plus was heavily addicted to coke, making him unable to work on any movie set.
As a favor to their agent, our actress begrudgingly agreed to do a romantic comedy.
She was miserable the entire time (mostly because the now ex-husband knew that she was sleeping with her then A-list leading man, mostly to calm her nerves).
She also feuded with her costar, an A-/B+ list comedic actress, whom she accused of upstaging her.
Turns out the movie was one of her biggest hits.
Barbra Streisand
Husband: Elliott Gould
Movie: What’s Up, Doc?
Slept with: Ryan O’Neal
Co-star: Madeline Kahn